Movement & Expansion Joints

[GazTech]

Many suspected adhesive failure calls I visit, leave out vital expansion or movement joints where they are required. Where a customers concrete base extension meets the suspended timber floor of the original house, and vast meterage of flooring on top of UFH. There are a few ways in which these stresses can be relieved from the flooring, enabling the tiles to move freely without either 'tenting' or cracking across the point of movement. Please state wether you do or dont use expansion joints, and which type you use and why.....Gaz

Tenting as a result of expansion stress

 

[grumpygrouter]

I have never had a floor large enough to require intermediate expansion joints yet but I do leave an expansion joint round the perimeter and use Silicon as the medium.

 

[DHTiling]

This is getting quite a regular problem ...At the moment we are hearing more and more of these failures as gaz knows i passed one onto him just yesterday where a £3000 job has failed ....

 

[GazTech]

This is getting quite a regular problem ...At the moment we are hearing more and more of these failures as gaz knows i passed one onto him just yesterday where a £3000 job has failed ....

Hence my poll & bringing this subject up Dave, I think we should focus on this problem a little more on the forum...:yes:

 

[DHTiling]

Totally agree gaz......

This makes a good read and hopefully will help fixers etc more clued up...> HERE <

 

[andersontiling]

I have recently have 800m2 fail.the expansion joints placed every 5 lm..25 m2 grids.the problem seem to be residual movement caused by existing construction joints affected by rising damp.it is important to install expansions even if a cut tile has to be incorporated in the tiling mirroring the joint in the slab etc

jon

 

[GazTech]

I have recently have 800m2 fail.the expansion joints placed every 5 lm..25 m2 grids.the problem seem to be residual movement caused by existing construction joints affected by rising damp.it is important to install expansions even if a cut tile has to be incorporated in the tiling mirroring the joint in the slab etc

jon

Good point jon, if expansion is already incorporated in the substrate, it needs to be transferred through to the surface tiles...pointless having it expand underneath but not on top......Gaz

 

[pjtiler]

I have recently have 800m2 fail.the expansion joints placed every 5 lm..25 m2 grids.the problem seem to be residual movement caused by existing construction joints affected by rising damp.it is important to install expansions even if a cut tile has to be incorporated in the tiling mirroring the joint in the slab etc

jon

very important point there jon
i,m surprised it wasn't on the drawings or architects specifications
newbys take note!!!!

 

[andersontiling]

PIC OF EXPANSION JOINT WHERE SO MUCH MOVEMENT HAS OCCURED THAT IT HAS PUSHED THE NEOPRENE INSERT OUT OF THE JOINT

 

[DHTiling]

Wrong joint used then..imo....joints come in varying widths allowing for more expansion in the substrate....

Differing types can be found here.... Movement Joints, Expansion Joints And Control Joint Profiles - Schlüter-Systems